The third annual cat show tiptoed, sashayed and paraded into Madison Square Garden yesterday – complete with a new athletic contest that proves that this cats-travaganza isn’t just for pretty kitties anymore.

More than 300 participants representing 41 pedigreed breeds will compete in the two-day pageant, with one lucky puss today taking home the ultimate ribbon, Best in Show.

And for the first time, the Cat Fanciers’ Association-Iams Cat Championship features the Feline Agility Competition, essentially an obstacle course for cats.

Stardust, a 6-month-old Blue Russian, started strong yesterday, pouncing up three stairs and back down. Then, suddenly bored, she turned away from a pink hurdle and headed back to the starting line.

Night had fallen for Stardust. No amount of frenzied feather waving by owner Peg Johnson could persuade her charge to brave the tunnels, weaving poles and hoops. The timer was shut off and Stardust disqualified.

Johnson blamed a trinket malfunction, saying, “I don’t think she likes any of the toys.”

But Stardust’s brother, Chilly Willy, shined during his turn in the ring, maneuvering the obstacles in 22 seconds to lead the pack for the day.

The one with the best time wins a gold charm, but the results do not go toward a placement in Best in Show. Those are judged on looks alone.

Meanwhile, around the corner from Chilly Willy’s victory dance, orphaned cats – including Hurricane Katrina evacuees – were up for adoption.

Jared, a 2-month-old tabby from Louisiana, generated a lot of interest.

“He’s very well adjusted and has lots of energy,” said Jennifer, an Animal Haven volunteer.